Exhaust pipe attachment

ABSTRACT

Attachment for the discharge end of an upright exhaust pipe of internal combustion engines and Diesel engines.

Eliied States Patent 1191 Harmon Feb. 19, 1974 [54] EXHAUST PIPE ATTACHMENT 2,468,961 5/1949 Curphy 181/72 ux [75] Inventor: Marshall C. Harmon, Waterloo,

Iowa 1,854,515 4/1932 Jackes 98/60 UX {73] Assignee: Waterloo Foundry Co., Inc.,

Waterloo Iowa Primary ExaminerJerry W. Myracle [22] Filed: Jan. 12, 1972 Attorney, Agent, or Firm-Molinare, Allegretti, Newitt 21 Appl. No.2 217,126 Wltcoff 52 US. Cl. 138 108 181 72 1511 Int. Cl. Fdln 7/00 '[57] ABSTRACT [58] Field of Search 138/108; 181/72; 98/60 Attachment for the discharge end of an upright haust pipe of internal combustion engines and Diesel [56] References Cited engines UNITED STATES PATENTS 2,887,033 5/1959 Wachter, Jr. 181/72 UX 7 Claims, 3 Drawing Figures I I l I l EXHAUST PIPE ATTACHMENT BACKGROUND OF THE INVENTION The present invention relates to an attachment for the discharge end of upright exhaust pipes of internal combustion engines and Diesel engines for the purpose of reducing and preventing entry of foreign matter such as rain, water, snow and dust into the exhaust pipe. When moisture is permitted to enter and collect in an exhaust pipe of such engines, it frequently causes difficulty in starting as well as in operation of the engines and in addition causes rapid rusting and deterioration of the exhaust pipe and other parts of the engines.

One of the objects of this invention is to provide an extremely simple and efficient attachment of the character indicated comprising a single, unitary member of tubular formation.

Another object is to provide a novel attachment of the character indicated which is constructed and arranged so as to preclude entry of free falling rain, snow or other foreign matter through the discharge port of the attachment, into the discharge opening of the exhaust pipe.

A further object is to provide a novel attachment of the character indicated which is constructed and arranged so that moisture entering through the discharge port of the attachment is caused to contact and flow downwardly along the inner surface of the attachment and be discharged at its lower end thereof, exteriorly of the exhaust pipe.

Other objects and advantages of this inventionwill be apparent from the following description, taken in connection with the accompanying drawings:

BRIEF DESCRIPTION OF THE DRAWING taken as indicated at line 33 on FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The attachment embodying the present invention comprises a single, unitary member which, as illustrated in the drawing, is in the form of a length of steel tubing. It is to be understood, however, that the attachment embodying the novel features of this invention may also be in theform of a unitary metal casting.

As shown in the drawing, the attachment formed of a single length of steel tubing, of generally circular cross-section throughout its length, having an upright lower portion and an upper portion 11, angularly offset relative to the lower portion. The outer free end of the upper portion terminates in a port 12, opening in a lateral direction and lying in a plane at an acute angle to vertical, sloping downwardly in the direction of the bottom of the lower portion 10, of the attachment.

Pressed out of the lower end of the lower portion 10 of the attachment are a plurality of circumferentially spaced apart, interiorly projecting ribs 14, which extend in an upwardly direction and are dimentioned so that when the attachment is applied to the upper end of an upwardly extending exhaust pipe, as indicated in dot-dash outline at A, said ribs substantially embrace the outer surface of the exhaust pipe. Also provided in said lower end of the lower portion 10, of the attachment are a plurality of circumferentially spaced apart stop means, herein shown in the form of nubbins or lugs 16. While these nubbins or lugs may be formed in spaced relation to the ribs 14, preferably, as shown in the drawings, they are pressed out of a portion of each of the ribs 14, adjacent the upper ends thereof, as clearly seen in the drawing. These nubbins or lugs 16 are adapted, when the attachment is applied to the upper end of the exhaust pipe A, to abut against the upper end of the exhaust pipe for limiting the extent of telescopic engagement of the attachment on the exhaust pipe.

When the attachment is telescoped over the upper end of the exhaust pipe, the spaces between each adjacent pair of ribs 14, constitute passageways 18, through which any moisture flowing down the inner surface of the attachment is caused to be discharged exteriorly of the exhaust pipe.

The lower end of the lower portion 10, of the attachment is also formed with a plurality of circumferentially spaced apart, upwardly extending, open ended slots 20, so that the portions of the wall of the lower end of the lower portion of the attachment, between adjacent slots, may be constricted in the process of firmly and rigidly securing the attachment to the exhaust pipe. It is to be understood that the attachment may be firmly and rigidly secured in place on the exhaust pipe by utilization of a conventional flexible strap or band (not shown), which surrounds the lower end of the lower portion of the attachment, in registration with the discharge end of the exhaust pipe, and which strap or band is usually formed at its extremeties with a pair of ears interconnected by a bolt or screw for tightening the band to firmly secure the attachment in place.

As may be seen in FIG. 1 of the drawing, the relationship between the upper portion 11 and the lower portion 10 of the attachment is such as to provide a critical angle of entry, as indicated by the dot-dash line B, for precluding free falling moisture from passing through the port opening 12 of the attachment and entering the exhaust pipe when the attachment is secured on the end ofthe exhaust pipe. It will also be apparent that any moisture entering the port opening 12 of the attachment from a lateral direction will be caused to contact the interior surface of the tubular attachment and will be caused to flow in a downdwardly direction for discharge through the passageways 18, exteriorly of the exhaust pipe.

It will be appreciated that by forming the attachment from either a single length of steel tubing or as a unitary casting the inner walls of the entire length of the attachment will be smooth, continuous and uninterrupted.

from the port opening 12 at the upper end of the attachment to a zone immediately adjacent the upper ends of the ribs 14, at the lower end of the lower por tion of the attachment. Such a construction thus insures control of flow of any moisture that enters the attachment for discharging it at the lower end of the attachment, exteriorly of the exhaust pipe.

By reason of the fact that the attachment embodying the present invention may be formed solely from a single length of steel tubing or as a unitary metal casting, it should be apparent that such a simplified construction will result in substantial economies in manufacture and efficiency in use as compared to prior available attachments of this general type.

I claim:

1. An attachment adapted to be telescoped over the discharge end of an upright exhaust pipe of an engine, said attachment being formed solely from a one-piece tubular member having an upright lower portion and an upper portion angularly offset relative to the lower portion, said upper portion having a port opening laterally at the outer end thereof, the lower end of the lower portion having a plurality of circumferentially spaced apart, interiorly projecting ribs extending in an upwardly direction and dimensioned for engaging the exterior surface of the exhaust pipe and thereby defining passageways between adjacent pairs of ribs, through which moisture entering the attachment is caused to drain and discharge exteriorly of the exhaust pipe.

2. An attachment as called for in claim 1, together with stop means projecting interiorly of said lower portion inwardly beyond said ribs and adapted to abut the upper end of the exhaust pipe for limiting the extent of telescopic engagement of the attachment on the exhaust pipe 3. An attachment as called for in claim 2, wherein said stop means comprises a plurality of circumferentially spaced apart nubbins. I

4. An attachment as called for in claim 2, wherein said stop means comprises nubbins located in vertical registration with at least two of said ribs.

5. An attachment as called for in claim 1, wherein the inner surface of said tubular member is smooth, continuous and uninterrupted from a zone adjacent the upper ends of said ribs to said port opening.

6. An attachment as called for in claim 5, wherein said upper portion is so related to the lower portion as to insure that any moisture entering the port is caused to contact the interior surface of the tubular member and flow downwardly for discharge through said passageways when the attachment is mounted on an exhaust pipe.

7. An attachment as called for in claim 1, wherein the upper portion and its outer free end are so related to the lower portion as to provide a critical angle of entry for precluding free falling moisture from entering the exhaust pipe when the attachment is mounted on said exhaust pipe. 

1. An attachment adapted to be telescoped over the discharge end of an upright exhaust pipe of an engine, said attachment being formed solely from a one-piece tubular member having an upright lower portion and an upper portion angularly offset relative to the lower portion, said upper portion having a port opening laterally at the outer end thereof, the lower end of the lower portion having a plurality of circumferentially spaced apart, interiorly projecting ribs extending in an upwardly direction and dimensioned for engaging the exterior surface of the exhaust pipe and thereby defining passageways between adjacent pairs of ribs, through whIch moisture entering the attachment is caused to drain and discharge exteriorly of the exhaust pipe.
 2. An attachment as called for in claim 1, together with stop means projecting interiorly of said lower portion inwardly beyond said ribs and adapted to abut the upper end of the exhaust pipe for limiting the extent of telescopic engagement of the attachment on the exhaust pipe.
 3. An attachment as called for in claim 2, wherein said stop means comprises a plurality of circumferentially spaced apart nubbins.
 4. An attachment as called for in claim 2, wherein said stop means comprises nubbins located in vertical registration with at least two of said ribs.
 5. An attachment as called for in claim 1, wherein the inner surface of said tubular member is smooth, continuous and uninterrupted from a zone adjacent the upper ends of said ribs to said port opening.
 6. An attachment as called for in claim 5, wherein said upper portion is so related to the lower portion as to insure that any moisture entering the port is caused to contact the interior surface of the tubular member and flow downwardly for discharge through said passageways when the attachment is mounted on an exhaust pipe.
 7. An attachment as called for in claim 1, wherein the upper portion and its outer free end are so related to the lower portion as to provide a critical angle of entry for precluding free falling moisture from entering the exhaust pipe when the attachment is mounted on said exhaust pipe. 